US2812241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming crystalline magnesia of high purity and of high density
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1953-11-16
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Granted: 1957-11-05
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Expires: 1973-11-16
Abstract
No abstract record available.
Inventors
- 👤 Wallace O Austin
- 👤 Clarence A Rick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:58
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02; C01F5/06; C01F5/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR PREPARING DENSE PERICLASE REFRACTORY MATERIAL WHICH COMPRISES INTIMATELY ADMIXING A FINELY DIVIDED MAGNESIUM COMPOUND WHICH FORMS PERICLASE UPON FIRING, CONTAINING AT LEAST 95.0% MGO, NOT OVER 2% SIO2 AND NOT OVER 2% CAO ON AN IGNITED BASIS, A BORON MATERIAL AS A CRYSTALIZATION PROMOTER, SAID BORON MATERIAL BEING ADDED IN AN AMOUNT TO PROVIDE 0.25% TO 5.0% BY WEIGHT BORON AS ADDED CALCULATED AS B2O3 ON THE FIRED BASIS, A CHROMIUM MATERIAL IN AN AMOUNT TO PROVIDE FROM 0.10* TO 2.0% BY WEIGHT THEREOF AS ADDED, CALCULATED AS CR2O3 OF THE FIRED BASIS AND FIRING SAID ADMIXING WITHOUT FUSION TO FORM WELL CRYSTALLIZED PERICLASE.
Claim 2
Dependent Claim
107 words
A PROCESS FOR PREPARING DENSE PERICLASE REFRACTORY MATERIAL WHICH COMPRISES INTIMATELY ADMIXING A FINELY DIVIDED MAGNESIUM COMPOUND WHICH FORMS PERICLASE UPON FIRING, CONTAINING AT LEAST 95.0% MGO, NOT OVER 2% SIO2 AND NOT OVER 2% CAO ON AN IGNITED BASIS, A BORON MATERIAL AS A CRYSTALIZATION PROMOTER, SAID BORON MATERIAL BEING ADDED IN AN AMOUNT TO PROVIDE 0.25% TO 5.0% BY WEIGHT BORON AS ADDED CALCULATED AS B2O3 ON THE FIRED BASIS, A CHROMIUM MATERIAL IN AN AMOUNT TO PROVIDE FROM 0.10* TO 2.0% BY WEIGHT THEREOF AS ADDED, CALCULATED AS CR2O3 OF THE FIRED BASIS AND FIRING SAID ADMIXING WITHOUT FUSION TO FORM WELL CRYSTALLIZED PERICLASE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |